Time. For the most part beer's enemy is time, specially for a beer with only 4.5%. But in 2000, as I've mentioned a few times, I clearly remember having a Burton Bridge Porter that was overwhelmingly bitter and pleasantly foul due no doubt to its utter mishandling and disregard. Some time ago I resolved to recreate the effect through the powers of experiment and stuck away two bottles for aging. Tonight, I pop the older of the two, this one carrying a best before date of December 2006 to see what is what.
Findings? The bottle pops with a merry pffftt! and gives off a little of the aroma of an East India sherry. The cream head quickly dissipates to a floating froth. In the mouth, the beer is more watery than a fresh bottle but pleasant enough though sadly not soured. There is a Orval quality to the bittering hops, lacy and lavender-ish, with some residual milk chocolate but none of the roasti-toastiness.
Verdict? Pretty much an entire waste of the effort which went into this experiment except for the fact that it really cost me nothing in terms of time, money or energy. It is somewhat impressive that it was so stable as to be more than drinkable. I am, however, not that impressed with stability as a general thing.